bazel build instructions in README not working

[blickly]

I'm hitting what look like breakages inside "zlib" when trying to run the bazelisk build command given to build the repo at head:

$  bazelisk clean && bazelisk build --verbose_failures //:compiler_unshaded_deploy.jar
INFO: Analyzed target //:compiler_unshaded_deploy.jar (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
ERROR: /usr/local/google/home/blickly/.cache/bazel/_bazel_blickly/09474313ad65bad59ec9aec61a59c7c6/external/zlib/BUILD.bazel:31:1: undeclared inclusion(s) in rule '@zlib//:zlib':
this rule is missing dependency declarations for the following files included by 'external/zlib/zutil.c':
  '/usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h'
  '/usr/lib/gcc/x86_64-linux-gnu/10/include/limits.h'
  '/usr/lib/gcc/x86_64-linux-gnu/10/include/syslimits.h'
  '/usr/lib/gcc/x86_64-linux-gnu/10/include/stdarg.h'
Target //:compiler_unshaded_deploy.jar failed to build
INFO: Elapsed time: 0.183s, Critical Path: 0.09s
INFO: 0 processes.
FAILED: Build did NOT complete successfully

This looks like an issue in a dependency, so I'm hoping that this will go away on it's own, but I wanted to check if anyone has seen something like this before? @nreid260, maybe?

[blickly]

@nreid260 pinged me that the magic ingredient is the --expunge flag.

So running:

bazelisk clean --expunge

did the trick, in case other folks hit mysterious errors like this.

[blickly]

From looking through the bazel issue tracker, it looks very likely to me that this is the same as bazelbuild/bazel#9213, which also gave a "undeclared inclusion(s)" error inside "zlib" on an APT-based linux system after an update.